While I don't think that humor and seriousness necessarily have to be separate, I don't think I usually put an extraordinary amount of thought into my posts. It really depends on how tired I am, and how much free time I have. If I'm well rested, and it's a weekend, then I usually try to put a decent amount of thought and consideration into my posts.
Another part of it is also shyness. In serious subjects, I tend to be worried that I'll sound stupid if I provide too much input, as there are always people who know far more about the subject than I do. And since, as I said before, I like to add at least a little humor in my posts, I'm worried that I might inadvertently offend someone.
Another part of it is also shyness. In serious subjects, I tend to be worried that I'll sound stupid if I provide too much input, as there are always people who know far more about the subject than I do. And since, as I said before, I like to add at least a little humor in my posts, I'm worried that I might inadvertently offend someone.